The Rev. Samuel T. Lloyd III is the priest-in-charge at Trinity Church in Boston, an Episcopal church. He was the ninth dean of the Washington National Cathedral, and he preached from the cathedral’s pulpit about global warming and the need for Christians to act. Email him through the contact form on Trinity Church’s website.

Shira Gabriel is an assistant professor of psychology at the University at Buffalo in Buffalo, N.Y., who has conducted three studies on celebrity worship, one of which focused on how it boosts the worshipper’s self-esteem.

Read a July 1, 2004, article by Carlin Flora about celebrity worship syndrome. It’s posted on the Psychology Today Web site.

August 1996, Our Planet article by Fazlun Khalid about the Islamic approach to environmentalism. Khalid directs the Islamic Foundation for Ecology and Environmental Sciences.

Rebecca Greenwood is co-founder and president of Christian Harvest International and Strategic Prayer Action Network (SPAN). She is the author of Destined to Rule: Spiritual Strategies for Advancing the Kingdom of God (2007), in which she discusses the role and responsibilities of Christians as “rulers” over creation.

Cassandra Carmichael is the executive director of the National Religious Partnership for the Environment. Previously, she served as director of the National Council of Churches’ Eco-Justice Programs and has written numerous articles on faith and the environment.

Edward Brown is the founding director of Care of Creation, a Christian environmental mission agency based in Madison, Wis. He is the author of Our Father’s World: Mobilizing the Church to Care for Creation.

Sandra Barnes is a professor of human and organizational development at Vanderbilt University in Nashville, Tenn., whose research interests include the sociology of religion. She is the author of The Black Mega Church: Framing and Addressing HIV/AIDS and Poverty in the Age of Health and Wealth Theology.

The Cedar Tree Institute works with organizations, including religious groups, to develop environmental projects in Northern Michigan.